Sewing machine



Dec. 10, 1929.

B. T. LEVEQUE SEWING MACHINE Original Filed Feb. 2, 1924 3 Sheets-Shet lWbwas a w Dec. 10, 1929. B. T.YLEVEVQUE 1,739,243

SEWING MACHINE O i in Filed 1924 3 Shets-Sheet 2 Mess hg'rztor 1929. B.T. LEVEQUE 1,739,243

SEWING MACHINE Original Filed Feb. 2, 1924 3 SheetsSheet 5 Patented Dec.10, 1929 UNITED STATES .HPATENT orrlca BERNARD '1. LEVEQUE, OF WENHAM,MASSACH'O'SETTS, ASSIGNOB TO UNITED SHOE MACHINERY CORPORATION, OFPATEBBON, NEW JERSEY, A CORPORATION OF NEW JERSEY snwm'o mom Originalapplication flied February 2, Serial No. 690,265. Divided and thisapplication filed October 19, 1025. Serial m. 68,228.

The present invention relates to shoe sewing machines and is hereinshown as embodied in a sole sewing machine of the socalled McKay type,the stitch formlng devices of which comprise a straight hook needle andthe work support of which consists of a rotatable horn arranged toextend within the shoe and provided at its tip with a needle threadingdevice or whirl for laying the thread in the hook of the needle. Inaddit on, such machines include shoe feeding devices and a presser footwhich is movable relatively to the horn to clamp the work and release itrangement of parts hereinafter described and claimed. The severalfeatures of the present invention and the'advantages attained therebywill be readily understood by those skilled in the art from thefollowing descript on taken in connection with the accompanymg drawingswhich illustrate the several features of the invention as apphed to aMcKay sewing machine.

Fig. 1 is a view in front elevation of the head of the machine with aportion of the horn and of the work being operated upon shown insection; Fig. 2 is a central longitudinal vertical section of the frontortlon of thehead of the machine; Fig. 3 is a detail view illustratingin front elevation certain portions of the presser foot liftingmechanism, the mechanism for varymg the throw of the needle and thefeeding mechanism.

For a detailed description of the complete machine to which the presentinvention has i been applied, reference may be had to the applicantspending application Serial No. 690,265, filed February 2, 1924, of whichthe present application is a division.

The stra1ght hook needle of the machine s clamped on the lower end of aneedle bar 6 which-is reciprocated from a crank pm 8 on [the forward endof the sewing shaft 10 through the following connections, which comections are provided for the purpose of glvlng a variable throw to theneedle bar as Work varies in thickness, and also for the urpose ofpermitting the needle bar to be 'sconnected from the sewing shaft at thetop of its stroke at the end of the sewing operation. A block 12 issecured to the needle bar and is connected by a link 14 to a lever 16pivoted at 18 to a lever 20, which lever is secured at its right handend to a pivot shaft 22 mounted in the machine frame.

he right hand end of the lever 16, as viewed from the front of themachine, is provided with a curved slot 24 which is engaged by a block26 pivotally mounted in the upper end of an arm 28 which is adjusted asthe work varles in thickness by connections to the presser foothereinafter described. When the axis of the block 26 is coincident withthe axis of the pivot shaft 22 the lever 16 will move with the lever 20as the lever 20 is oscillated. If the axis of the block 26 is not inalignment with the axis of the pivot shaft 22 the lever 16 will movewith relation to the lever 20 during the oscillation of the lever '20and the movement imparted to the needle bar increased or diminishedaccordingly. A lever 30 is mounted at the side of" the lever 20 and atits right-hand end is secured to a sleeve 32 surrounding the pivot shaft22 of the lever 20.. A cam slot 34 is formed in the lever 30, which camslot is engaged by the crank pin 8 so that during the rotation of thecam shaft the lever 30 is continuously oscillated. To cause the lever 20to oscillate with the lever 30 a latch 36 is mounted upon the left handend of the lever 20 and is arranged to engage a pin 38 on the lever 30.During the sewing operation the latch is held in engagement with the pinb means of a spring surrounding the pivot o the latch. The presser footbar is indicated at 40 and has secured thereto a block provided with alaterally extending arm 42 in the outer end of needle,

the arm 28 is moved to adjust the block 26 along the slot 24 of thelever 16 and thus vary the upward stroke of the needle bar.

The presser foot is forced downwardly 5 against the work by means of aspring 48 surrounding the presser foot bar, and also by a spring whichsurrounds a shaft 50. An arm 52 is secured to the shaft 50 and isconnected to a block 54 on the lower end of the presser foot bar bymeans of a link 56.

The nature and object of the invention having been indicated and theparts of the machine embodying the invention having been described, whatis claimed is:

1. A sewing machine having, in combination, a driving shaft arranged atright angles to the direction in which the work is fed through themachine, a crank pin at the end of the shaft, a lever oscillating in aplane at right angles to the shaft provided with a cam slot engaged bythecrank pin, a needle bar, and connections between the lever and needlebar.

2. A sewing machine having, in combination, a sewing shaft, a crank pinon the shaft,

a lever oscillated in a plane at right angles to the shaft provided witha cam slot engaged by the crank pin, a needle bar, connections betweenthe lever and the needle bar, and

means controlled by the thickness of the work for actuating saidconnections to vary the stroke of the needle.

3. A sewing machine having, in combination, stitch forming devicesincluding a needle, needle actuating mechanism comprising a constantthrow lever, a variable throw lever directly pivoted thereon andextending substantially parallel therewith, needle actuating connectionsbetween said variable throw lever and the needle, a fulcrum for saidvariable throw lever fixed except as it is moved to vary the needlethrow, and means controlled by the thickness of the work for moving saidfulcrum to vary the needle throw.

4. A sewing machine having, in combination, stitch forming devicesincluding a needle, needle actuating mechanism comprising a constantthrow member, a lever pivoted thereon, a needle bar, connections fromone end of the lever to the needle bar, a fulcrum for the other end ofthe lever, and means controlled by the thickness of the work pivot ofthe lever.

5. A sewing machine having, in combination, a sewing shaft, a crank pinon the shaft, a lever oscillating in a plane at right angles to theshaft provided with a cam slot engaged by the crank pin, a needle bar,and connections between the lever and the needle bar adjustable to varythe stroke of the needle.

6. A sewing machine having, in combination stitch forming devicesincluding a needle actuating mechanism comprising a constant throwlover, a variable throw lever directly pivoted thereon and extendingsubstantially parallel therewith, needle actuating connections betweensaid variable throw lever and the needle, and a fulcrum for saidvariable throw lever adjustable to vary the stroke of the needle andfixedexcept as it is adjusted.

A sewing machine having, in combination, stitch formin devices includinga needle, needle actuatlng mechanism comprising a constant throw member,a lever pivoted thereon, a needle bar, connections from one end of thelever to the needle bar, and a fulcrum for the other end of the leveradjustable toward and from the pivot of the lever.

8. A sewing machine having in combination, a sewing shaft, a crank pinat the end of the shaft, a lever oscillating in a plane at right anglesto the shaft provided with a cam slot engaged by the crank pin, aconstant throw lever actuated by the slotted lever, a variable throwlever pivoted on the constant throw lever, and a fulcrum for thevariable throw leveradjustable to vary the stroke of the needle.

9.. A sewing machine having, in combination, stitch formin devicesincluding a needle, needle actuating mechanism comprising a constantthrow lever, a variable throw lever pivoted thereon and extendingsubstantially parallel therewith, needle actuating connections betweensaid variable throw lever and the needle, and a fulcrum for the saidvariable throw lever adjacent the fulcrum of the constant throw leveradjustable to vary the stroke of the needle.v

In testimony whereof I have signed my name to this specification.

BERNARD T. LEVEQUE.

for moving the fulcrum toward and from the p

